What animal has the biggest eyes?

Measuring 11 inches across or more, the eyes of the colossal squid are the largest of any animal in the world. Marine scientists in New Zealand studying a carcass of one creature in 2007 recorded the measurement of the eye, which they believe was even larger when the squid was alive.

The rare colossal squid is known to descend to depths of up to 6,500 feet, using the large lenses of its eyes to help capture light in the dark depths where it hunts. This is the largest known invertebrate in existence and thought to reach lengths of up to 46 feet.